CN111312138A - Automatic brightness correction method applied to display panel - Google Patents

Automatic brightness correction method applied to display panel Download PDF

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Publication number
CN111312138A
CN111312138A CN201911199293.XA CN201911199293A CN111312138A CN 111312138 A CN111312138 A CN 111312138A CN 201911199293 A CN201911199293 A CN 201911199293A CN 111312138 A CN111312138 A CN 111312138A
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CN
China
Prior art keywords
gamma curve
sub
gamma
display panel
target
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Withdrawn
Application number
CN201911199293.XA
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Chinese (zh)
Inventor
蔡忠松
张佑民
林言翰
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Raydium Semiconductor Corp
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Raydium Semiconductor Corp
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Publication of CN111312138A publication Critical patent/CN111312138A/en
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2003—Display of colours
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/10—Intensity circuits
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0242—Compensation of deficiencies in the appearance of colours
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0686—Adjustment of display parameters with two or more screen areas displaying information with different brightness or colours
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Controls And Circuits For Display Device (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

The invention discloses an automatic brightness correction method applied to a display panel, which comprises the following steps: (a) dividing a display area of a display panel into a plurality of sub-areas; (b) obtaining a Gamma curve corresponding to each sub-region; (c) selecting a target Gamma curve from the Gamma curves; (d) adjusting the Gamma curves corresponding to the plurality of sub-regions to make the Gamma curves approach to the target Gamma curves; and (e) the whole display area of the display panel adopts the target Gamma curve as a mapping table of the Gamma value.

Description

Automatic brightness correction method applied to display panel
Technical Field
The present invention relates to a display, and more particularly, to an automatic brightness correction method applied to a display panel.
Background
With the development of display technology and the demand of consumers, the size of display panels on the market tends to be larger and larger, such as display screens of 60 inches or more.
However, due to the physical limitations of the display panel process, the larger the size of the display panel, the more likely the problem of inconsistent brightness of each display area on the display panel, commonly referred to as Mura (brightness non-uniformity) phenomenon, occurs. When the Mura phenomenon of the display panel is too severe, the entire display image may have non-uniform color blocks due to the brightness difference, resulting in poor yield of the display panel.
The conventional method for improving the brightness of the display panel is to divide the display area of the display panel into a plurality of sub-areas, and then manually perform a brightness correction procedure for each sub-area.
For example, as shown in fig. 1, the entire display area DA of the display panel may be divided into 12 sub-areas SA1 to SA12, and then the brightness correction procedure is manually performed for the 12 sub-areas SA1 to SA12. However, as the size of the display panel increases, the number of sub-regions divided by the display panel also tends to increase, which results in that the time required for brightness correction of the whole display region becomes very long, and since the Mura phenomenon of each display panel is not necessarily the same, the brightness correction procedure is performed manually for each display panel, which is time and labor consuming and extremely inefficient.
Disclosure of Invention
Accordingly, the present invention is directed to an automatic brightness correction method for a display panel, so as to effectively solve the above-mentioned problems encountered in the prior art.
An embodiment of the invention is an automatic brightness correction method applied to a display panel. In this embodiment, the automatic brightness correction method includes the following steps:
(a) dividing a display area of the display panel into a plurality of sub-areas;
(b) obtaining a Gamma curve corresponding to each sub-region;
(c) selecting a target Gamma curve from the Gamma curves;
(d) adjusting the Gamma curves corresponding to the plurality of sub-regions to make the Gamma curves approach to the target Gamma curves; and
(e) the whole display area of the display panel adopts a target Gamma curve as a Mapping table (Mapping table) of Gamma values.
In an embodiment, in the step (b), the Gamma curve corresponding to each sub-region is obtained by referring to the Gamma curve.
In one embodiment, the target Gamma curve in step (c) corresponds to a specific sub-region of the plurality of sub-regions.
In one embodiment, the method further comprises the following steps between the steps (a) and (b): the average brightness of the plurality of sub-regions is calculated respectively.
In one embodiment, the step (d) adjusts the Gamma curves corresponding to the sub-regions other than the specific sub-region among the plurality of sub-regions to approximate to the target Gamma curve.
In an embodiment, the plurality of sub-regions includes at least a first sub-region and a second sub-region, the first sub-region corresponds to the first Gamma curve and the second sub-region corresponds to the second Gamma curve.
In an embodiment, if the target Gamma curve is the first Gamma curve, the second Gamma curve is adjusted to approach the first Gamma curve.
In an embodiment, if the target Gamma curve is the second Gamma curve, the first Gamma curve is adjusted to approach the second Gamma curve.
In an embodiment, the plurality of sub-regions further includes a third sub-region, and the third sub-region corresponds to a third Gamma curve.
In an embodiment, if the target Gamma curve is the first Gamma curve, the second Gamma curve and the third Gamma curve are adjusted to approach the first Gamma curve.
In an embodiment, if the target Gamma curve is the second Gamma curve, the first Gamma curve and the third Gamma curve are adjusted to approach the second Gamma curve.
In an embodiment, if the target Gamma curve is the third Gamma curve, the first Gamma curve and the second Gamma curve are adjusted to approach the third Gamma curve.
Compared with the prior art, the automatic brightness correction method applied to the display panel provided by the invention can be used for respectively calculating the Mura value of each sub-area in the whole display area of the display panel, automatically detecting the brightness difference between the sub-areas and automatically correcting the Gamma value of the whole display area according to the brightness difference, so that the brightness of the picture displayed in the whole display area is more uniform, the condition that the color blocks of the display picture of the display panel are not uniform is effectively improved, the yield of the display panel is improved, the time spent by the traditional brightness correction program is greatly saved, and the efficiency is improved.
The advantages and spirit of the present invention can be further understood by the following detailed description of the invention and the accompanying drawings.
Drawings
Fig. 1 is a schematic diagram illustrating a display area DA of a display panel in the prior art being divided into 12 sub-areas SA1 to SA12, and brightness of each sub-area is manually corrected.
FIG. 2 is a flowchart illustrating an automatic brightness correction method applied to a display panel according to a preferred embodiment of the present invention.
FIG. 3 is a flowchart illustrating the application of the automatic brightness correction method of the present invention to a display area of a display panel including 12 sub-areas.
Description of the main element symbols:
S10-S19
S20-S28
DA.
Sub-region SA 1-SA12
Detailed Description
Reference will now be made in detail to exemplary embodiments of the invention, examples of which are illustrated in the accompanying drawings. The same or similar numbered elements/components used in the drawings and the embodiments are used to represent the same or similar parts.
An embodiment of the invention is an automatic brightness correction method applied to a display panel. In this embodiment, the display panel can be disposed on various products such as a computer screen, a television, a display, and the like, which are commonly available in the market, and the type and the architecture of the display panel are not particularly limited.
Referring to fig. 2, fig. 2 is a flowchart illustrating an automatic brightness correction method applied to a display panel in this embodiment.
As shown in fig. 2, the automatic brightness correction method may include the following steps:
s10: dividing a display area of the display panel into a plurality of sub-areas;
s12: calculating the average brightness of the plurality of sub-regions respectively;
s14: obtaining a Gamma curve corresponding to each sub-region;
s16: selecting a target Gamma curve from the Gamma curves;
s18: adjusting the Gamma curves corresponding to the plurality of sub-regions to make the Gamma curves approach to the target Gamma curves; and
s19: the whole display area of the display panel adopts a target Gamma curve as a Mapping table (Mapping table) of Gamma values, so that the brightness of the picture displayed in the whole display area becomes more uniform.
In practical applications, the step S12 is used to calculate the Mura values of the sub-regions in the display region of the display panel, so as to automatically detect the brightness difference between the sub-regions, but not limited thereto. In step S14, a Gamma curve corresponding to each sub-region is obtained by referring to the Gamma curve, but not limited thereto. The target Gamma curve in step S16 corresponds to a specific sub-region of the sub-regions, but not limited thereto. Step S18 is to adjust the Gamma curves corresponding to the sub-regions except the specific sub-region in the plurality of sub-regions to approximate to the target Gamma curve, so as to automatically correct the Gamma values of the entire display region of the display panel.
For example, the plurality of sub-regions includes at least a first sub-region and a second sub-region, wherein the first sub-region corresponds to the first Gamma curve and the second sub-region corresponds to the second Gamma curve. If the target Gamma curve is the first Gamma curve, the second Gamma curve is adjusted to be close to the first Gamma curve. If the target Gamma curve is the second Gamma curve, the first Gamma curve is adjusted to be close to the second Gamma curve.
Similarly, the plurality of sub-regions may further include a third sub-region, and the third sub-region corresponds to a third Gamma curve. If the target Gamma curve is the first Gamma curve, the second Gamma curve and the third Gamma curve are adjusted to be close to the first Gamma curve. If the target Gamma curve is the second Gamma curve, the first Gamma curve and the third Gamma curve are adjusted to be close to the second Gamma curve. If the target Gamma curve is the third Gamma curve, the first Gamma curve and the second Gamma curve are adjusted to be close to the third Gamma curve. The rest can be analogized, and thus, the description is not repeated.
For example, if the display area of the display panel is divided into 12 sub-areas (i.e. the first sub-area to the twelfth sub-area), as shown in fig. 3, the method of the present invention can include the following steps:
s20: calculating the average brightness of the first sub-area to the twelfth sub-area respectively;
s22: respectively obtaining a first Gamma curve to a twelfth Gamma curve corresponding to the first sub-region to the twelfth sub-region;
s24: selecting a target Gamma curve from the first Gamma curve to the twelfth Gamma curve (assuming that the target Gamma curve is the twelfth Gamma curve);
s26: adjusting the first Gamma curve to the eleventh Gamma curve to make it approach to the target Gamma curve (i.e. the twelfth Gamma curve); and
s28: the whole display area of the display panel adopts the target Gamma curve (namely the twelfth Gamma curve) as the mapping table of the Gamma value, so that the brightness of the picture displayed in the whole display area becomes more uniform.
Compared with the prior art, the automatic brightness correction method applied to the display panel provided by the invention can be used for respectively calculating the Mura value of each sub-area in the whole display area, automatically detecting the brightness difference between the sub-areas and automatically correcting the Gamma value of the whole display area according to the brightness difference, so that the brightness of the picture displayed in the whole display area is more uniform, the condition that the color blocks of the displayed picture are not uniform is effectively improved, the yield of the display panel is improved, the time spent by the traditional brightness correction program is greatly saved, and the efficiency is improved.

Claims (12)

1. An automatic brightness correction method applied to a display panel is characterized by comprising the following steps:
(a) dividing a display area of the display panel into a plurality of sub-areas;
(b) obtaining a Gamma curve corresponding to each sub-region;
(c) selecting a target Gamma curve from the Gamma curves;
(d) adjusting the Gamma curves corresponding to the plurality of sub-regions to make the Gamma curves approximate to the target Gamma curve; and
(e) the target Gamma curve is adopted by the whole display area of the display panel as a mapping table of Gamma values.
2. The method of claim 1, wherein the Gamma curve corresponding to each sub-region is obtained by a reference Gamma curve in the step (b).
3. The method of claim 1, wherein the target Gamma curve in step (c) corresponds to a specific sub-region of the plurality of sub-regions.
4. The method of claim 1, further comprising the following steps between steps (a) and (b): the average brightness of the plurality of sub-regions is calculated respectively.
5. The method according to claim 3, wherein the step (d) adjusts Gamma curves corresponding to sub-regions other than the specific sub-region among the plurality of sub-regions to approximate the target Gamma curve.
6. The method of claim 1, wherein the plurality of sub-regions comprises a first sub-region and a second sub-region, the first sub-region corresponding to a first Gamma curve and the second sub-region corresponding to a second Gamma curve.
7. The method of claim 6, wherein if the target Gamma curve is the first Gamma curve, the second Gamma curve is adjusted to approach the first Gamma curve.
8. The method of claim 6, wherein if the target Gamma curve is the second Gamma curve, the first Gamma curve is adjusted to approach the second Gamma curve.
9. The method of claim 6, wherein the sub-regions further comprise a third sub-region corresponding to a third Gamma curve.
10. The method of claim 9, wherein if the target Gamma curve is the first Gamma curve, the second Gamma curve and the third Gamma curve are adjusted to approximate the first Gamma curve.
11. The method of claim 9, wherein if the target Gamma curve is the second Gamma curve, the first Gamma curve and the third Gamma curve are adjusted to approach the second Gamma curve.
12. The method of claim 9, wherein if the target Gamma curve is the third Gamma curve, the first Gamma curve and the second Gamma curve are adjusted to approach the third Gamma curve.
CN201911199293.XA 2018-12-12 2019-11-29 Automatic brightness correction method applied to display panel Withdrawn CN111312138A (en)

Applications Claiming Priority (2)

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US62/778,329 2018-12-12

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US11727843B2 (en) * 2021-10-19 2023-08-15 Synaptics Incorporated Device and method for display brightness control
TWI823681B (en) * 2022-11-18 2023-11-21 友達光電股份有限公司 Display device and image display method

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US7518621B2 (en) * 2003-03-27 2009-04-14 Sanyo Electric Co., Ltd. Method of correcting uneven display
US7696968B2 (en) * 2006-12-27 2010-04-13 Au Optronics Corporation Liquid crystal display apparatus with color sequential display and method of driving the same

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